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Experiences in using gas dispersion measurements to evaluate metallurgical performance of scavenger cleaner and recleaner circuit at Vale's Thompson Mill

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Journal of Central South University 2014年第10期21卷 3955-3962页

作者：刘洪均张炜孙春宝 School of Civil and Environmental Engineering University of Science and Technology Beijing Department of Business Administration Chinalco China Copper Corporation Limited

The performance of a flotation circuit is largely the result of the operator's response to visual clues. This includes manipulation of the gas input and how it is distributed to cells in a bank. A new gas dispersion technology was presented which was conducted to perform characterization tests in Outokumpu 30 m3 and 50 m3 flotation cells installed at Thompson Vale's concentrator, and subsequent data analysis. The experimental program was designed to establish "as-found" baseline conditions for each cell of the two-parallel banks in the scavenger-cleaner and recleaner circuit, to select and characterize one typical cell in the two banks with either different frother concentrations or different air flow rates, and establish what variables can be manipulated in future characterization work. A three-parameter model was developed in order to link the bubble size and frother concentration. This relationship can be used to correlate gas dispersion change to improved metallurgical performance.

关键词： bubble size bubble size distribution bubble surface area flux gas dispersion

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Experimental and numerical investigation of gas diffusion under an urban underground construction

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能源与人工环境(英文) 2021年第4期2卷 436-444页

作者： Kang Zhou Fei Li Hao Cai Yibin Yang Fusheng Peng Li Chen Junyi Zhuang Department of HVAC College of Urban ConstructionNanjing Tech UniversityNanjing 210009P R China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityNanjing 211189P R China College of National Defense Engineering Army Engineering UniversityNanjing 210007P R China PLA Unit 96784 LuoyangHenan 471399P R China

Rapid increase of urban underground constructions has a great consideration of underground environment safety and how to expel toxic gasses out of tunnels *** utility tunnel is a typical urban tunnel construction with multiple underground pipelines including gas pipelines,and it is necessary to investigate characteristic of gas diffusion and monitor gas leakage to ensure tunnel *** this study,the experimental measurements of airflow and gas distributions were conducted in a 10 m full-scaled utility tunnel mockup,and gas diffusion characteristic was also *** simulation of utility tunnel leakage was also conducted by computational fluid dynamics(CFD).Different turbulence models and different air supply diffuser models were compared via the experimental results based on visualization and the relative root-mean-square error(RRMSE)index,which quan-titated the difference between the numerical and experimental *** results showed that the standard k−εturbulence model and random air opening model could provide better results than other *** to the experimental data analysis,it was necessary to consider the optimization of monitoring detector arrangements in actual utility *** study provided basic experimental data and the validated numerical model for the leakage source identification and underground tunnels simulation research.

关键词： Urban tunnel gas leakage gas dispersion CFD Turbulence model Air supply diffuser

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Effect of Temperature on gas Hold-up in Aerated Stirred Tanks

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Chinese Journal of Chemical Engineering 2003年第2期11卷 204-207页

作者：高正明施力田 College of Chemical Engineering Beijing University of Chemical Technology

gas holdups in ambient gassed and hot sparged systems with multiple modern impellers and the effect of temperature on gas holdup are reported. The operating temperature has a great impact on gas holdup though the gas dispersion regime in the hot sparged system is similar to the ambient gassed condition. The gas holdup under the elevated temperature and the ambient gassed operation is successfully correlated. With the same total gas flow rate and power input, the gas holdup in the hot sparged system (say near the boiling point) is only about half of that in the ambient system. The results imply that almost all existing hot sparged reactors have been designed on the basis of incorrect estimates of the gas holdup during operation.

关键词： gas holdup temperature effect gas dispersion hot sparged reactors radar probe stirred tank

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CFD Based Simulation of LNG Release during Bunkering and Cargo Loading/Unloading Simultaneous Operations of a Containership

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Journal of Shipping and Ocean Engineering 2017年第2期7卷 51-58页

作者： FAN Hongjun CHENG Kang WU Shunping Wuhan Rules and Research Institute of China Classification Society Wuhan 430022 China

In order to reduce waiting time in port for large LNG （liquefied natural gas） fueled ships, it is suggested that LNG STS （ship to ship） bunkering and cargo loading/unloading should be carried out simultaneously. This study investigated the safety zone of an LNG bunkering vessel with 10,000 cubic meters capacity transferring LNG fuel to an LNG fueled 18,000 TEU containership. Four LNG leakage scenarios were identified based on failure frequencies analysis of piping systems and severity of consequence, three-dimension CFD software FLACS was adopted to calculate flammable cloud dispersion after LNG leakage. As a result, we obtained a rectangle dangerous zone （41.3 m ~ 126 m）, outside of this dangerous zone can be def＇med as safety zone. It is concluded that safety zone of LNG STS bunkering and cargo loading/unloading SIMOPS （simultaneous operations） cannot keep the same, there are different results for different designs and operation locations. Due to high frequencies and severe consequences, two typical scenarios, the leakage of LNG hose and the natural gas releases from bunkering tank＇s safety relief valve during bunkering, cannot be ignored in similar study.

关键词： LNG fueled vessel bunkering simultaneous operations gas dispersion dangerous zone.

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